How about my idea.
If there is a place like a D&D dungeon and each player can bring one of their hero to the dungeon in a group with other players. hunt monsters, root some items in a chance and kill boss monster to get new achievement!!, there are shamen hero specializing at healing other units and also high knight which is a good tank unit in the game now and other heros as well. players could make a good combination using different heros in their group and will create new stratiges to clear the dungeon. when I played the game with couple of heros, they just reminds me of the game Bardurs gate lol and that made me thought about this idea.

I love the idea! CoOp with Heroes only, and up to 6 players would be fun, or even more players up to 20. Something we did hope to achieve in the future after pathfinding updates allow us to have PvP with more than 2 players at once.